I have never, and will never use slin with my GH. Unless you know exactly what you are doing with slin, it can kill you within seconds. Dont believe all you hear about how you need to use slin with HGH to get any results. I had a training partner that was preparing for the same show as me, we were both doing the EXACT same cycles, with the exception of him using slin with his GH. His gains were no better than mine, and maybe not better at all. There is some benefit of using slin, but the drawbacks definately out weigh the benefits. If you do decide to use it, just make sure you have done your reaearch and have everything worked out to an absolute science. I have been on GH for 2 years and never plan on using slin.